STV82X7D datasheet(61/149 Pages) STMICROELECTRONICS

61 / 149 page

61/149

STV82x7

AGC_GAIN

IF AGC Control and Status Register

Note:

When AGC_CMD = 0, AGC_ERR[4:0] can be read -- indicating the input level. It can also be written

to -- presetting the AGC level which will then adjust itself to the final value.

When AGC_CMD = 1, the AGC is off and writing to AGC_ERR[4:0] directly controls the AGC

amplifier gain. Reading AGC_ERR just confirms the fixed value.

AGC_CST[1:0]

AGC Time Constant

This is the time constant between each step of 1.5 dB by the AGC.

Step Duration (ms)

1.33

2.66

5.33

10.66

Address: 0Fh

Type: R/W

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

AGC_ERR[4:0]

SIG_OVER

SIG_UNDER

Bit Name

Reset

Function

Bit 7

Reserved.

AGC_ERR[4:0]

00000

Amplifier Gain Control

This is the Gain Control value of AGC. There are 20 steps of +1.5 dB (see Note below).

00000: Gain-min

10100: Gain-min + 30db

11111: Gain-min + 30db

SIG_OVER

AGC Input SIgnal Upper Threshold

0: Normal signal

1: Signal too large and AGC is overloaded

SIG_UNDER

AGC Input SIgnal Lower Threshold

0: Normal signal

1: Signal too small and AGC is underloaded

When the AGC is in Automatic mode (AGC_CMD = 0), bits SIG_OVER and SIG_UNDER indicate

if the input signal is too small/large and the AGC is under/overloaded. This is useful when setting

the STV82x7 SIF input level.

Bit Name

Reset

Function

STV82X7D 数据表(PDF) 61 Page - STMicroelectronics

STV82X7D 数据表(HTML) 61 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

数据表下载